Roll grinding machine



May 19,1936. u A. e. BELDEN ET AL.

ROLL GRINDING MACHINE Filed Jan. 14, 1936 2 Sheets-Sheet l H i h o '7 N 63 t \9 1' B? A HLEER'T G. BELDEN HERBERT JGR/FFINB i 1936f A. G. BELDEN ET AL 2,040,820

ROLL GRINDING MACHINE Filed Jan. 14, 19156 2 Sheets-Sheet 2 3 a 76 a f-- 2 '"1 FILBERT E. BELDEN k HERBERT J. GRIFFINB Patented May 19, 1936 UNITED STATES PATENT oFFieE ter, Mass,

assigncrs to Norton Company,

7 Worcester, Mass, a corporation of Massachusetts Application January 14, 1936, Serial No. 59,008 7 Claims. (01. 5195) -This invention relates to grinding machines, and more particularly to a roll grinding machine for grinding a convex or concave crown on a roll.

One of the objects of this invention is to provide a simple, thoroughly practical roll grinding machine forgrinding a predetermined crown on the periphery of a roll. Another object isrto provide a roll crowning apparatus of a simplified form in which either a concave or a convex roll may be ground. A further object of this invention is to provide a roll grinding machine with a crowning device in which the extent of crown produced may be readily adjusted. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and

2 the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which is shown one of the various possible embodiments of the mechanical features of this invention,

Fig. l is a front elevation of a roll grinding machine embodying this invention;

Fig. 2 is a fragmentary plan view of the roll grinding machine shown in Fig. 1; L

Fig. 3 is a fragmentary front elevation, on an 30 enlarged scale, of the table traverse control mechanism; 7 V

Fig. 4 is a sectional view through the table traverse mechanism taken approximately'on the line 4-4 of Fig. 3; and

Fig. 5 is a fragmentary side'elevation of th grinding wheel supporting slide and the feeding mechanism, having parts broken away to more clearly show the construction. As illustrated in the drawings, a roll grinding 40 machine has been illustrated in the drawings comprising a base l0 having a pair of swivel bases II and I2 which are pivotally connected to the base II] by the pivot pins l3 and 14 which are preferably located adjacent the inner ends of the bases II and I2 respectively.

An adjusting mechanism is providedadjacent to the outer end of each of the swivel bases II and I2 so that the bases may be adjusted into alignment with each other or at an angle to each other to produce either a convex or a concave crown on the work piece being ground. The swivel base I I is provided with outwardly extending brackets l5 and I6 which are provided with opposed adjusting screws l1 and I8 which are screw threaded into the brackets1l5 and. I6 re-:

spectively and are arranged to engage the front and rear surfaces of the base Iii. The end of the swivel base II is provided with an index finger l9 which is arranged opposite to a graduated scale on the base l0. Itwill be readilyapparem from the foregoing disclosure that by adjusting the screws H and I8, the swivel base H may be adjusted relative to the base it. The adjust-. ment may be made-in accordance with the graduated scale 20 so that the swivel base H may be adjusted so that its ways are parallel to the base H0 or at an angle thereto, as illustrated in Fig. 2, for grinding a convex crown on the roll being ground.

Similarly, the outer end of the swivel base 12 isprovided with transversely extending brackets 2i and 22 which carry adjusting screws 23 and 24 respectively. The adjusting screws 23 and 24 are screw threaded into the brackets 2i and 22 and are arranged to engage opposite surfaces of the base Illto permit adjustment of the swivel base l2 relative thereto. a The swivel base I2 is provided with an index finger 25 which is arranged to cooperate with a graduated scale2t on the base It so that the swivel base l2 may be adjusted into the desired angular position relative to the base IE). The swivel base H is provided with a V-way 3 and a flat way 3! which serve to support a longitudinally movable table 32 thereon. The swivel base I2 is provided with a V-way 35 and a flat way 36 which serve to slidably support a longitudinally movable table 3?. A work supporting table 40 is pivotally connected to the tables 32 and 3'! by means of pivot pins 4| and 42, so that the table 40 is moved longitudinally by movement of the tables 32 and 31.

The work supporting table 40 is provided with a rotatable work support for a roll to be ground. The rotatable work support may comprise a headstock 4E and a footstock 4'? which are provided with work supporting centers 48 and 49 which serve to support and rotate the roll 45.

A rotatable grinding wheel 50 is supported on a wheel spindle 5| which is in turn rotatably supported on a transversely movable wheel slide 52. The grinding wheel slide 52 is providedwith ways 53 which mate with correspondingly shaped ways (not shown) on the base I0. The grinding wheel spindle 5! is preferably rotated'by means of an electric motor 55 mounted on the upper surface of the wheel slide 52. The motor is provided with a driving pulley 55 which is connected by driving belt or belts 5? with a pulley 58 mounted on the end of the wheel spindle 5|.

The grinding wheel slide 52 is arranged for a transverse movement on the base I so that the wheel 50 may be fed toward or from the periphery of the roll 45 being ground so that the roll may be ground to a predetermined size. Fhe wheel feeding mechanism may comprise a half nut 50 depending from the under surface of the wheel slide 52 and arranged to mate with a rotatable feed screw 35 which is journaled in bearings (not shown) in the base I0. The front end of the feed screw 53 carries a spiral gear 52 which meshes with a spiral gear 53 which is mounted on the lower end of a rotatable shaft 6 5. Shaft 84 is supported in a bearing which is fixed to the base It. The upper end of the shaft -3 carries a manually operable feed wheel 35 which is arranged so that rotation thereof will cause the feed screw to be rotated in either direction, depending on the direction of rotation of the hand wheel 58, so as to cause the half nut 3%) to transmit a transverse feeding movement to the wheel slide 52 and the grinding wheel 56 to move the wheel either toward or from the work piece being ground.

The longitudinally reciprocable tables 32 and 31 are reciprocated preferably in synchronism with each other along their respective bases II and I2. These tables may be reciprocated by independent table reciprocating mechanisms, or in the preferred construction, one of the tables may be positively reciprocated and the other table operatively connected to follow the positively reciprocated table.

In the preferred construction, the table 32 is connected to the table 31 by means of a link 10 which is pivotally connected to the table 32 by a stud 11 and is pivotally connected at its other end to the table 31 by a stud 12. The table 31 is positively reciprocated by means of a table traverse mechanism to be hereinafter described, and due to the connecting link 10, the table 32 is reciprocated by the power transmitted by the table 31.

In the construction illustrated, a table traverse or reciprocating mechanism has been illustrated, of the type shown in the prior patent to Norton No. 162,838 dated June 14, 1904, to which reference may be had for details of disclosure. As illustrated in the drawings, the table 31 is provided with a depending rack bar 15 by which the table 31 may be traversed either by manual or power traverse mechanism, such as that shown in the above-mentioned prior patent. A gear 16 meshes with the rack bar 15 and is mounted on a rotatable shaft 11 which may be rotated manually by means of a gear 18 mounted on the outer end of the shaft 11. The gear 18 meshes with a gear 19 which is rotatably supported on a stud 80. The stud 80 is supported by a bracket BI mounted on the base l0. A manually operable table traverse wheel 82 is mounted on a hub of the gear 19 and connected thereto, by means of which the table 31 may be traversed longitudinally on the base I0 through the gear 19, the gear 18, the shaft 11, and the gear 13 meshing with the rack bar 15.

The table I I may be reciprocated longitudinally by a power operated mechanism, as shown in the prior patent above referred to. anism may comprise a rotatable power driven shaft 85 which is driven by a multiple speed drive contained within a casing 85, details of which have not been shown in the present case, since they are not considered part of the present invention. For details of this mechanism, reference This mech may be had to the above-mentioned prior patent. The rotatable shaft 85 drives a clutch member 86 which is arranged to engage either the clutch member 81 or the clutch member 88 which are formed integral with bevel gears 89 and 00 respectively. The bevel gears 89 and 80 mesh with a large bevel gear 9| mounted on the front end of a rotatable shaft 92. The large bevel gear 9| is rotated in either direction, depending upon the engagement of the clutch member 86 with either 10 the clutch member 81 or 88.

The clutch member 86 may be shifted automatically by means of a reversing lever 95 which is actuated by reversing dogs 90 and 91 which are adjustably supported in a T-slot 98 on the 15 front of the work table'31. The reverse lever 95 actuates a load and fire mechanism 99 to control the movement of the clutch member 86 to control the direction of reciprocatory movement of the table 31. The shaft 92 carries a gear I00 which meshes with a gear IOI mounted on a shaft I02. The shaft I02 also carries a gear I03 which meshes with a gear I04 mounted on the shaft 11.

In order that the power reciprocation of the :13 table 31 may be disconnected, a clutch member I08 is interposed between the gear IOI and the gear I03. When the clutch I08 is in the position illustrated in Fig. 4, the power reciprocation of the table is disconnected and the table 31 may 1;? be traversed manually by rotation of the hand traverse wheel 82. A yoked member I09 engages the clutch member I08 and is supported for longitudinal movement by a shaft H0 which is actuated by a pivotally mounted lever I II on fl) the front of the machine base. When the lever I II is rocked toward the machine base, the shaft I I0 is moved toward the left, as viewed in Fig. 4 to move the clutch member I08 in the same direction to engage it with a clutch member H2 4, which is formed integral with the gear I03. When the clutch member I08 is moved into engagement with the clutch member I I2, the power rotation of the gear 9| is transmitted through the gear I00, the gear IN, the gear I03, the gear I04, 45 the gear 16, to the rack 15, to reciprocate the table 31 longitudinally relative to the base I0. For further details of disclosure as to the manual or power traverse of the table 31, reference may be had to the disclosure in the above-mentioned prior patent to Norton.

As the table 31 is reciprocated either manually .or by power, the table 32, due to the connecting link 10, will follow and be reciprocated through an identical stroke, thus moving in synchronism with the table 31 so as to carry the work support through the desired reciprocatory stroke.

In order to produce a predetermined crown on the periphery .of the roll being ground, the sub-bases II and I2 are adjusted to the desired predetermined position by means of the screws I1 and I8 and 23 and 24, so that either a straight cylindrical surface may be produced or a concave crown, as desired. If the sub-bases II and I2 are adjusted so that the table ways 30, 3| and 35, 36 are in alignment with each other, then when the tables 32 and 31 are reciprocated, the roll being ground will travel in a straight line path and the grinding wheel will grind a true cylinder on the periphery of the roll 45. If the sub-bases II and I2 are adjusted into the positions illustrated in Fig. 2, namely so that the outer ends of the tables are moved toward the rear of the machine to an identical extent, the roll supporting table 40 instead of being moved Iii in a straight line path, will be carried through an arcuate path so as to generate a concave crown on the periphery of the roll 45. If desired to produce a convex crown on the periphery of the roll, the sub-bases Hand l2 are adjusted so that their outer ends are moved toward the front of the machine, thus carrying the work supporting table 40 in an arcuate path so as to generate a convex crown or form on the periphery of the roll 45 as the tables 32 and31 are reciprocated longitudinally to reciprocate the roll 45 relative to the grinding wheel 50.

The operation of this roll grinding machine will be readily apparent from the. foregoing disclosure. The roll 45' to be ground is rotatably supported on the headstock center 48 and footstock center 49, and the sub-bases II and I2 are angularly adjusted by means of the adjusting screws l1, I8, 23 and 24, so that the index fingers l9 and 25 are moved to an identical position on the graduated scales 20 and 26 so as to produce the desired form on the periphery of the roll 45. As above explained, if the index fingers I 9 and 25 are adjusted to the zero reading on the scale, that is the center graduation, the roll will be ground to'a true cylinder. If the sub-bases are adjusted into the position illustrated in Fig. 2, with the index fingers l9 and 25 to the rear of the zero or center reading, then a concave crown will be produced on the roll being ground. If the index fingers I9 and 25 are adjusted forward of the zero or central reading on the scales 20 and 26, then a convex crown will be ground on the roll 45 as the table 40 is reciprocated by the longitudinally movable tables 32 and 31.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim:-

1. A roll grinding machine having a rotatable grinding wheel and a rotatable work support which are movable longitudinally relative to each other, means to cause said wheel and work support to move transversely relative to each other, and means to move one of said elements in an arcuate path to grind a predetermined crown on the periphery of the work piece including a table to rotatably support one of said elements, a pair of spaced angularly arranged longitudinally movable tables, pivotal connections between said longitudinally movable tables and the ends of sa1d first table, means to synchronously rec1procate said tables to cause a relative reciprocation between the wheel and work support, and adjustable supports for each of said longitudinally movable tables. j

2. A roll grinding machine havlng a rotatable grinding wheel and a rotatable work support which are movable longitudinally relative to each other, means to cause said wheel and work support to move transversely relative to each other, and means to move one of said elements in an arcuate path to grind a predetermined crown on the periphery of the work piece including a table to rotatably support one of said elements, a pair of spaced angularly arranged longitudinally movable tables, pivotal connections between said longitudinally movable tables and the ends of said first table, means to synchronously reciprocate supports for-each of said longitudinally movable 5 tables,'and means to adjust the position of said. supports to vary the arcuate path and thereby vary the extent of crown on the work piece.

3. A roll grinding machine having a rotatable grinding wheel and a rotatable. work support which are movable longitudinally and transversely relative to each other, means to cause said wheel and work support to move transversely relative to each other, means to move said wheel and work support longitudinally relative to each other, and means to move one of said elements in an arcuate path during said longitudinal movement to grind a predetermined crown on the periphery of the work piece including a table to rotatably support one of said elements, a pair of spaced longitudinally reciprocable tables, pivotal connections between said longitudinally movable. tables and the opposite ends of said first'table, a sub-base interposed between each of said tables and the machine base, each sub-base having slideways to support one of said tables, means to automatically reciprocate one of said tables, and connections between said positively reciprocated table and the other table to cause a relative reciprocation between the wheel and worksupport" ing table to grind a predetermined curved or crowned face on the surface of the work.

4. A roll grinding machine having a rotatable grinding wheel and a rotatable work support which are movable longitudinally relative to each 35 other, means to cause said wheel and work support to move transversely relative to each other, and means to move one of said elements in an arcuate path to grind a predetermined crown on the periphery of the work piece including a table to rotatably support one of said elements, a pair of spaced longitudinally movable tables, a subbase interposed between each of said tables and the base, each sub-base having slideways to support one of said tables, pivotal connections be- 45 tween said longitudinally movable tables and the opposite ends of said first table, and means to synchronously reciprocate said tables to cause a relative reciprocation between the wheel and the work support to grind a predetermined curved or 50 crowned face on the surface of the Work piece.

5. A roll grinding machine comprising a base,

a transversely movable wheel slide thereon, a rotatable grinding wheel carried by said slide, means to feed said slide transversely relative to 55 the base to cause the grinding wheel to approach or recede from the work piece, a rotatable work support including a table, a pair of spaced longitudinally movable tables each of which is pivotally connected to opposite ends of said work supporting table, a pair of spaced swivel subbases on said base arranged to support said longitudinally movable tables, means to simultaneously traverse said tables longitudinally relative to said swivel bases to reciprocate the rotatable work support relative to the grinding wheel, and means to adjustably swivel said sub-bases relative to the base of the machine so that the ways thereon are at an angle to each other so that when the tables are reciprocated, the work supporting table and rotatable work support are moved through an arcuate path to grind a predetermined convex or concave crown on the roll being ground.

6. A roll grinding machine comprising a base,

a rotatable grinding wheel, a transversely movable wheel slide to support said wheel, means to move said slide transversely relative to the base to cause the grinding wheel to approach or recede from the work piece, a work supporting table, a rotatable worksupport on said table, a pair of spaced longitudinally reciprocable tables, pivotal connections between said tables and the ends of said work supporting table, a pair of spaced adjustably swivelled sub-bases supporting said tables and interposed between said longitudinally movable tables and the base, said sub-bases having ways to slidably support the spaced reciprocable tables, a reciprocating mechanism which is operatively connected to reciprocate one of said longitudinally movable tables relative to its supporting sub-base, connections between said spaced longitudinally movable tables so that the second longitudinally movable table follows as the other table is positively reciprocated, and means to angularly adjust the sub-bases relative to the machine base so that the table ways are in alignment with each other or at an angle to each other to grind either a true cylindrical surface or a convex or concave crowned surface. on the roll being ground. A

7.'A roll grinding machine comprising a base, a transversely movable grinding wheel slide thereon, a rotatable grinding wheel carried by said slide, means to feed said slide transversely relative to the base to cause the grinding wheel to approach or recede from the work piece, a rotatable work support including a table, a pair of spaced longitudinally movable tables each of which is pivotally connected to the opposite end of said work supporting table, a pair of spaced swivel sub-bases on said machine base arranged to support said longitudinally movable tables, means to simultaneously traverse said tables longitudinally relative to said sub-bases to reciprocate the rotatable work support relative to the grinding wheel, and means including a graduated scale associated with each of said sub-bases to adjust the angular position of the sub-base relative to the machine base so that the ways thereon are at an angle to each other so that when the tables are reciprocated, the work supporting table and rotatable Work support are moved through an arcuate path to grind a predetermined convex or concave crown on the roll being ground.

ALBERT G. BELDEN.

HERBERT J. GRIFFING. 

